Lifting mechanism for stamp-mills and the like.



T. FREY.

LIFTING MECHANISM FOR STAMP MILLS AND THE LIKE.

Fly. 2

To all whom it'may concern..-

I -'rncuononrnuv, or noon-Donn; SWITZERLAND.

LIFTI'NG FOR "STAMP-MIKE'S AND THE Specification 'of Letter 5' Patent.

PatentedFeb. 3,1914.

Application meaara 7, 191 s. -Seria-15No. 766,243.

Be it known that I, Tnnonon F REY, a citizen of the Republic ofSwitzerland, residing at Hoc'hdorf, in the Canton of Luzerne, Republicof Switzerland, have invented certain new and useful Improvements inLifting Mechanism for Stamp-.Mills or the like; and I do hereby declarethe following to bee full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use thesame, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

The present invention has for its object to provide an improved liftingmechanism for stamp mills or the like. This apparatus is provided with aclamping frame con stantly moving up and down and with a brakeautomatically preventing the free falling of the bars.

One embodiment of this invention is illustrated by way of example in theaccompanymg drawing.

Figure l is a side view of the apparatus, Fig. 2 shows the clampingframe partly in a side view taken from the left in Fig. .1, partly insection. Fig. 3 is a plan view of the brake. Fig. 4 is a detail showingthe manner of mounting certain of the elements described below.

The bar 0 to be lifted and let fall is mounted in two guides at and b sothat it may be moved upward and downward with its axis in verticalposition. Each of these guides is provided with a laterally extendingarm to which one end of a vertical rod (Z is firmly attached. To thisrod (Z a stop 6 is fastened projecting toward the bar 0 and below thisstop the rod d is provided with a bearing-arm 7' extending on theopposite side of the rod. An angular lever 9, one end of which projectsaway from the rod (Z, is pivotally mounted on the bearing-arm f. Aboveits knee the angular lever g is provided with a stop pin it extendingthrough the bearing-arm f and the rod (Z and constantly held in the pathof a nose k by means of a spring 71. In Fig. 1 the dotted line positionof nut K shows the latter engaging pin it. One end of the spring entersthe pin and the other end is secured to bar (Z. The nose k is providedon a screwnut k connecting the two parts of a twoparted screw-spindle j,7' One of these parts a right-handed, and the other a lefthanded threadso that when the nut 10 is turned in one or the other direction the part7' is moved to and fro in axial direction. The party is provided on itsfree end a clamping plate at projecting through a slot on the wall of atga'iiding piece m which surrounds the bar 0 and forms part of aclamping frame n. This frame is suspended, by means of rods 11 to :arotary craafk (not shownj so that it is constantly moved up and down.The part 7' of 17119; spindle 7' is pro'viaded on its free end. whichprojects out of the nut 70, with a wedge shaped fhead 7' A wedge :0 isprovided between this head "and, the frame a and adapted to be moved ina vertical dovetail groove in said head by means of a screw 0 mounted inthe frame a. By moving the wedge 0' the action 'of the clamping plate atcan be regulafed. Below the clumping frame m, the bar 0 is embraced bytwo brake-blocks 79 which normally rest on the hearing I). On 'twopoints placed one above the other each" of said blocks 17 is connected,by means oilf a how with two levers 1" one on i1ih :side of the bar 0,in such a manner, that when the lever m oscillates up and down thebrakebloeks 7; strongly embrace and release the bar -0 alternately. Thereleasing takes place however only in such a manner that thebrake-blocks are always in contact with the bar so that they are able toembrace them strongly and immediately when the bar sinks so that theymay prevent automatically the bar from falling.

The levers r are connected on their other ends to the free ends of astrap 8 oscillating upward and downward about a stationary axle t. Avertical rod a is pivoted at its upper end to the middle-part of thestrap 8 and with its lower end to a hand-lever o. This hand orregulating-lever effects by its own weight a constant raising of thelevers r and applying of the brake-blocks to the bar 0.

The operation of the described apparatus is as follows: As it wasalready said the frame a is continually moved up and down. In ordertoraise the bar 0 for a desired extent, the pin it is placed in the pathof the nose so that in the lowest position of the frame 17. thescrew-nut 7c is turned to the right (Fig. 1) and consequently the bar 0is clamped in the guide m At the next upward-movement of the frame a,the bar 0, on

which a rammer or the like may be provided, is lifted. When the nosestrikes the projection e, the screw-nut 7c is turned back and theclamping-plate m, moved away from the bar 0. This at once tends to fallbut is prevented therefrom by the brakeblocks p as these are at onceforced against the bar 0. The latter rests therefore in its raisedposition during the neXt downward movement of the brake-frame n and israised for the same extent at the next upward movement of the latter asset forth.

If it is desired to let fall the bar 0 after each upward stroke, thebrake-blocks 79 are put out of action by raising the lever 'v. If thebar 0 shall be moved up and down with the frame n but not be raised andlet fall alternately, the angle-lever g is raised by means of a rod whinged thereto and secured in this raised position by means of athumbscrew a. By this means the bolt 72, is kept out of the path of thenose 70 of the screw-nut 7c and therefore the bar 0 is not released fromthe clamping plate at but after the screw-nut is turned back again. Byregulating the position of the lever o the speed of the bar 0 in fallingmay be increased or decreased.

What I claim is 1. In a device of the class described, a bar to bereciprocated, a reciprocating frame for operating said bar, rotaryclamping mechanism within the frame including members having reversethreads and means for operating said member by the reciprocation of theframe.

2. In a device of the class described, a bar to be reciprocated, areciprocating frame, a threaded member within the frame for en gagingthe bar, a second threaded member the threads of the latter beingarranged in the opposite direction to those of the former, a nutengaging said members, and means for rotating the nut.

3. In a device of the class described, a re ciprocating frame, a bar tobe reciprocated by the frame, a clamping member in the frame, a threadedmember connecting with the clamping member, a second member having athread extending in the opposite direc tion, means for adjusting thesecond member, and a nut having threads reversely arranged engaging thethreaded members and means for operating the nut to move the clampingmember into engagement with the bar.

4. In a device of the class described, a reciprocating frame, a bar tobe reciprocated thereby, means carried by the frame and within the samefor positively engaging the bar, means for causing said means within theframe to be operated and a device for throwing the means last mentionedout of action.

In testimony whereof, I have signed my Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,Washington, D. C.

